Yes, you can certainly do this without using printf or sprintf. Number can be treated as string in perl. I will provide a simple regular expression solution since nobody has thought about it yet. ;-)

#!/usr/local/bin/perl -w
use strict;

my $xx = 12000/1000;   # wanted result is 12.0
my $yy = 12678/1000;   # wanted result is 12.7 - rounded up

print "\$xx = ", rounding_with_regex($xx), "\n";
print "\$yy = ", rounding_with_regex($yy), "\n";

sub rounding_with_regex
{
  my $num = shift;
  $num += 0.05;            # want to round up (as number)
  $num =~ s/\.(\d).*/.$1/; # perform the rounding (as string)
  return $num;
}
[download]

And the output is exactly as required -

$xx = 12.0
$yy = 12.7
[download]

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